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Accueil du site > Séminaires > Séminaires 2022 > MSC Seminar. May 16th 2022 at 11:30. Sébastien Michelin (Ladhyx, Ecole Polytechnique) : " Self-propulsion and interactions of chemically-active droplets"..

MSC Seminar. May 16th 2022 at 11:30. Sébastien Michelin (Ladhyx, Ecole Polytechnique) : " Self-propulsion and interactions of chemically-active droplets".

Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.


There will be a live diffusion with Zoom.

Monday May 16th, 11h30

Contact Michael Berhanu to attend the visio-seminar.

Self-propulsion and interactions of chemically-active droplets

Sébastien Michelin

LadHyX - Ecole Polytechnique Institut Polytechnique de Paris Palaiseau, France

Abstract : Chemically-active droplets slowly solubilizing in a surfactant-laden solution can self-propel spontaneously as a result of the non-linear transport of surfactant molecules and micellar compounds by thesolute-induced interfacial flows. Many recent experiments have reported the intriguing individual behaviour of these droplets, in particular the emergence of straight, curly and chaotic trajectories. Furthermore, such droplets are fundamentally anti-chemotactic : they avoid regions of solute accumulation such as their own chemical trail and the vicinity of other droplets or confining walls. In experiments on multiple-droplet interactions, this results in complex avoiding trajectories. Motivated by these observations, we use theoretical modeling and numerical simulations to rationalise these individual and collective dynamics. In this presentation, I will discuss our recent work on the nonlinear interplay of hydrodynamic and chemical interactions in droplet collisions or self-propulsion in confined environments. In particular, based on the analysis of the complete hydro-chemical interactions in a two-droplet collision, I will show how such pairwise collisions may lead to the emergence of a variety of collective dynamical regimes, as well as alignment and scattering of the droplets.


Contact : Équipe séminaires / Seminar team - Published on / Publié le 16 avril


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